Method GetStringValue

include/dmlc/parameter.h:632–636

  }

  std::string GetStringValue(void *head) const override {
    std::ostringstream os;
    PrintValue(os, this->Get(head));
    return os.str();
  }
  ParamFieldInfo GetFieldInfo() const override {
    ParamFieldInfo info;
    std::ostringstream os;